Rock-drill chuck



(No Model.)

J. B. MAAS.

ROCK DRILL CHUCK.

Patented Aug. 16, 1887.

UNITED STATES ATENT OFFICE.

JOHN B. MAAS, OF HUMBOLDT, MICHIGAN.

ROCK-DRILL CHUCK.

SPECIFICATION forming part of Letters Patent No. 368,295, dated August 16, 1887.

A pplicaiion filed Dccember27, 1886. Serial No. 222,562.

T0 aZZ whom it may concern:

Be it known that 1, JOHN B. Mass, a citizen of the United States, residing at Humboldt, in the county of Marquette and State of Michigan, have invented certain new and use fullmprovements in Rock-Drill Chucks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention is a chuck for rock-drills; and it consists in the parts which will be hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure l is a central vertical longitudinal sectional view of the chuck and connected parts. Fig. 2 is an end view of the same. Fig. 3 is an end view of the sleeve. Fig. 4 is a side view of the chuck, with the sleeve, gib, key, and cap removed, the dotted lincsindicating the opening and chambered parts. Fig. 5 indicates an end and side view, respectively, of the bush ing. Fig. 6 represents a face plan view of a. screw-cap.

Like letters indicate like partsin the several views.

The letter A indicates the chuck, provided with front and back chambers, A A These chambers are separated by a. wall, A. An opening, a, is formed in the upperside of the chuck. This opening communicates with the front chamber, A. a indicates the rabbeted front and rear edges of the opening a. The chamber A is internally screw-threaded for the reception of the threaded end of the stock B.

0 represents a sleeve, provided with an enlarged portion, 0. Said enlarged portion is provided with an inner recess, 0 for the reception of the key.

D indicates a key, which is enlarged at its inner end and gradually tapering to the other end, d. Said key is provided with end projections, (2 to prevent its displacement in the sleeve. The top part of the sleeve-recess C tapers slightly longitudinally, so as to conform to the taper feature of the key D. (See Fig. 1 and dotted lines, Figs. 2 and 3.)

E represents a gib, consisting of a lower portion, E, which extends downwardly through the top opening, a, in the chuck. The

(No model.l

upper portion of the gib extends above said opening and the key D rests on the top thereof.

E represents endshoulders on the gib,whieh prevent it from falling through the chuckopening a when the drill is removed.

F represents a collar on the front end of the chuck to prevent the forward displacement of the sleeve. Said collar is internally screwthreaded for the-reception of the screw-cap G.

H represents a trough-shaped bushing,which lies in the bottom of the front chuck-chamber, A. This bushing on its upper side is formed for the reception of a drillhaving an octagonal shank.

The bushing herein shown is the preferred form. The use of other forms, however, is contemplated. The cap G serves to hold the bushing in place.

The body of the key lies in the sleeve-recess G and rests on the top of the gib. \Vhen said key is driven backward to the position indicated in Fig. 1, the gib lies loose in its seat. The inner end of the drill may then be inserted into the chuck chamber or recess A. Then by forcing the key D forward in the sleeve-recess C the gib is forced downward by the depressing action of the enlarged part of said key. When the drill is thus firmly secured in the chuck and the drill and chuck operated in the usual manner, eaclr forward stroke tends to tighten the gib on the drillthat is to say, tightly retain the drill in the chuck. This is effected in the following manner: WVhen the drill strikes on its forward stroke, it stops abruptly. Thetendency of the stroke is to force the connected parts forward. It therefore follows that should the key be loose in the slightest degree a forward stroke will force the key slightly forward in its seat and thereby force the gib downward and more firmly bind the drill. The gib of course may be loosened or tightened by driving the key backward or forward.

Having thus described myinvention, Iclaim as new and desire to secure by Letters Patent- 1. The combination of a chuck having a chamber in its front end and a side opening communicating with said chamber, and a gib located in said opening, With a taper key and a sleeve provided with a recess tapered longitudinally for the reception of the key, saidkey being in the recess aforesaid, resting on the gib, and having projections d to abut the sleeve, substantially as specified.

2. The combination of a chuck having a chamber in its front end and a side opening communicating with said chamber, a gib located in said opening, a removable sleeve, and a key provided with end projections or shoulders, the key being interposed between the gib and sleeve,'substantially as specified, and for the purposes set forth. 7

3. The combination of a chuck having a chamber in its front end and an opening in its side communicating with said chamber, the outer end of the chuck being provided with a collar, F, a gib located in the opening aforesaid, a key, and asleeve, said key being interposed between the gib and sleeve, substantially as specified.

JoHn B. MAAS.

WVitnesses:

WM. J. MAAS, Gnonon J. MAAS. 

